In CloudBees CD, postp is a postprocessor included with CloudBees CD. postp uses regular expression patterns to detect interesting lines in a step log. Out of the box, it is already configured with patterns to handle many common cases such as error messages and warnings from gcc, gmake, cl, junit, and cppunit, or any error message containing the string error. postp also supports several useful command-line options, and it can be extended using matchers to handle environment-specific errors.